020 Subfield $c - Terms of availability:
Subfield $c contains the price or a brief statement of availability and any parenthetical qualifying information concerning the item. If only price information is present in field 020, data relevant to a single item is given in one subfield $c in one field 020 and data relevant to another item is given in another subfield $c in a subsequent 020 field.
Examples:
020 ##$a0802142176 (pbk.) :$c$1.95
020 ##$c$8.95
020 ##$cRs15.76 ($5.60 U.S.)
020 ##$cRental material
020 ##$cFor sale ($450.00) or rent ($45.00)
020 ##$cFor sale ($200.00 for 3/4 in.; $150.00 for 1/2 in.)
020 ##$c$4.95 (lib. bdg.)
020 ##$c$3.60 (pbk.)
[Two prices for two items on one catalog record; no ISBNs are known.]